Brake controlling lever mechanism



March 7, 1939. c. M. ANDERSON BRAKE CONTROLLING LEVER MECHANISM 2Sheets-Sheet 1 Filed March 25,/ 1958 gmc/Mofo ren March 7, 1939. c. M.ANDERSON BRAKE CONTROLLING LEVER MECHANISM Filed March 25, 193e 2sheets-sheet 2 l CM./\nvdyer-5von 3mm l l Wm da; 0. 0M

Patented Mar. 7,- 1939 A admi.

@ai emerse;

My invention relates to brake levers such as are employedlfin tighteningthefbrkeifbandfupon afbrake `druin."""Ivers`- titllis kiridmayeb'elern'- ployed`l`v generally-fin th "applicatior-fof brake bands"tof'drlmsbut it is intended 'niorepartie-J ularly for"f"application` tohoisting fduinsf-ffsch as are employed infr elin up5 cable-1in" hoistingoperatief-15.1# "1! '`i ii, l rvIt is an object of the invention toprovide a lever orf systein of lvers'-whereby Athebrake band maybe'easily andv positively applied to the drum when Jdesu-d. fwf y. 3*;:7I; .3: jauni? '111 si? t It is-"a furtherV object of the invention toprovide a Vlever-'whereby th'e forcapplid to l the brake band' inValip'lying"v the brake .-to'l the '-drum willincr'eas'e graduallyI'asf'thebrakeiis` tightened. vIt is La further"`bl5ject of `theinventi'on' to prolvide' a mechanism-fortightening the *brake band whichmay'b'e-iassembled' in-'cornpact form sofas to take up but little roombeside thef'bifake drum;

The"inv'ention'eresidesiflargelyfin`v the particular formand-*arrangement offtheV part's making up the invention-Aanilreferenceris' had to"tlheitirawf#j ings herewith ffwhereinthestructure fis=-clearly In Fig. 1 I have shown a side view of the leversemployed instighteningfthelbrake, the brake lever:-being"-moved=to@brakesetting position Fig. '2-isf a brokerntop"plarr-vievvofthe system-"oflevers shown-iri`-Fig;"-1. f Fig; 3fi`saf sidefview similar to Fig. 1showing the 'brake lever lmonnte'cFbesides-theibrakfdruin and With thebrakefbaridrin releasedposition- Fig.' 4v is *a-diagrammatic*view-showing V'the position ofthe parts irrthelopera'tingoff-the brake.

to and fronibra'ke applyirigposition. -I haveeshown'withparticulaireference to Fig.

3 a brake band 1-"having=fa =lining 2"the`rein' andv bearing againstthe'outerperiphery5 v'of' a--"brake 40 durrr3. 'f One'end-"of the11-hrakefband I is secured ih stationary positin-relativefto theplat'-form'or support p'onwliihfthe' brake `is mounted. IY provide 4ananchorbolt" I 4f' -secured adfjustably at `Within the basel The'upper-'end of=than'- chor postiis forkedfto prvideftwo endsupports mi'6, shown partieularly'inig2`, to receive -a i'cross pin 'I- about which*a' hinge? plate* 8 lon'the brake band is'lsc'uie'di" This end fofthefbrakef'band-"is usually-termed the'fdea'dnd-Q @i l' mf i Theopposite end'of the brake band is extend- ""1' ed forwardly heneaththe-"drinn to a l'point Aspaced somewhat fromf thef anchor fboltif 4'Yandis :there secured' fto aicro'ss'pinfS which is supported at itsendsin brake'arms II extending'downwardly l5 lat an` angleffromeafsleeve"-I2fmo y tedfupona emilia ooN'mouJNG navire biorsicaiiia, Tex.,assigner to Wm & OSllectng 'Qompan'm acer:

Serial N0. 198,019

brake shaft I3. The shaft I3 is mounted Within'afpost Mextendingupwardly from a base plate I5. Said base/plateisextendedYrearwardly from the shaft- Ir?)A arid hasfa rearward post AI6 withinwhich afstubflshfaftC Il'ais supported.l` The outer 5 end-ofthe'fshaftdis reduced somewhat in-di-Y amete'r 'andfservesfas-a supportfor a Ahand le- T '111 s' uw. f. i

f-The vlever I8 is shown as broken off but it is tobeiurderstodasrextending upwardly a suf- 1o cientdistance tobefeasilyrgrasped by the operator W-henfthef-brakes aretof-be'set. Thelower end-of theV leveris pivoted upon the shaft I3 and its movementtherefore has no eiect directly-upon-saidshaft. v

Adjacent the 4-lovver end of the lever is an elongated slot or-openingc2li: Withinwhich a pin. or stud 2 I -isffslidalo'leff 'I'here-f. is-fa`roller on Ythe pin =2If,-which'1ts `within:the-slot or opening 20 andmay'im'ove therein-from-one'end tol the other 20 of'said 'slotsHJ-l'hefpin-Aorfshaft-Z-I is 'mounted in theupper'end of vaoa'rn lever"222'which is pivoted at its -lovver1 end Pupo'n` thefstub 'shaft I1previouslynoted. -A-nutf23 upon the shaft I1 tends to hold the cam lever22 rotatablyiupon the-stub 25 ITI-Between the ends of the lever arm 22and on the innen face there`ofis an elongated-recess Y forming acamslotwithinfwhicha ro1ler-24 upon a-2pin25' may roll; The recessis--of 'sufficient 3o length to allow the necessarymovement thereinorf-the roller25 as-willbefnoted.- I Y vv-The roller -V2li rand the-piny251upon which it is mounted-arefsecured-'in the-'endof a shaft operatinglever ZGfprojecting rearwardlyand up- 35 Ward-1y from the 'shaft 13:'The lever 26 has at its lower end a sleeve or bushing 21 supported uponthe shaft I3 to which it-is secured nonrotatably by rneans'ofvthe key,indicated at'28 in Fig.-.2. .Thus,1as'=the4 shaft operating lever 40 26ismoved through itsfconnectionfwith the lever arm'22 thefshaft I3Willloe' given' a partial rotation.

The'brake arms II to which the attaching pin 9 isisecuredis-also-keyedtoithe shaft I3, as in- 45 dicatedin` dotted lines lair-29 in Fig.2. f Y H Itfwill` now' be seen that as the brake lever I8is swung-to theright of its position shown in Fig; 3ra-forceA will rbefexerted againstthe roller on the pin-2 Land-thusl operate the lever-22 tend- 50 ing tomove viti'inani aroforwardlyf-and `that, `as 1f -the leverf-arm `I8 fisgradually-movedto' itspo- .sitionin Fig. -1,fthe lever-arm I8 4will belengthenedrelative to-the-Weight-arm and the force applied to thefcamlever-arm 22 vwillincrease 55 Cru due to this increasing 'mechanicaladvantage. Also, as the lever arrn 22 is moved from one position, asshown in Fig. 3, to its position shown in Fig. l, the action will be tomove the roller 24 on the arm 26 downwardly in the recess in the arm 22,as indicated at 25a in Figs. 1 and 3. The shaft i3 will thus be rotatedin a counterclockwis-e direction. As the movement of the arm 22progresses the length of the power arms 2I-25 will also be increased, aswill be obvious.

The movement of the lever 26 will rotate the shaft i3 and thus exert apull upon the arms .l and set the brake. It will be .seen that the forceexerted to set the brake is an increasing one due to the mechanicaladvantage in the resultant increase in effective length of arm 25-l3relative to that of arm !3-9.

Fig. 4 has been developed to show the manner in which the leverage oneach one of the levers included in the system necessary to exert the nalpull upon the brake band increases in force with the movement of thelever arm.

With reference to this lever, the swinging of the lever arm in the arcindicated at 30 will gradually increase the leverage exerted upon thecam lever 22, for the distance between the position of 2i and the pointI3, as shown at 2l', 2l" and 2! etc. gradually shortens and the distanceon the lever arm I8 from the point 2l to 2|" inclusive, to the outer endis proportionally lengthened, thus giving a leverage advantage as thelever i8 is swung downwardly toexert a force upon the cam lever 22.

On the other hand, the movement of the lever 22 will exert an increasingforce to swing the arm 2S due to the fact that the end of the arm 26 at25 gradualy moves nearer to the fulcrum I1 of the lever 22. This samemechanical advantage is obtained between the levers 26 and the arms il,for as the point 25 on the lever 26 moves downwardly its leveragerelative to the fulcrum i3 increases while the length of the lever arm lI gradualy decreases relative to the application of the power thereto.

It is therefore obvious that my application of power to the brake bandto set the brake will function to exert a force toset the brake bandwhich constantly increases as the brake band is tightened upon the drum.This is of material advantage. The operator can with the ordinary handbrake exert all the power which is necessary to stop the drum fromrotation, evenunder heavy loads. The device is easy to operate and ismechanically safe and reliable. The further advantages will be obviousto those skilled in the art,

What is claimed is: Y

1. A brake drum, a brake band thereon, one end of which is fixed, abrake shaft, a brake arm fixed thereon at one end and secured to thefree end of said brake band at the other end, an operating lever xed onsaid shaft, a stub shaft, a cam lever pivoted thereon, a cam slot insaid cam lever, a roller on said operating lever movable in said slot, ahand lever pivoted to said brake shaft, a slidable connection betweensaid hand lever and one end of said cam lever, whereby the movement ofsaid hand lever will actuate said cam lever and said operating lever torotate said brake shaft, in the manner described.

2. A brake drum, a brake band thereon, one end of which is fixed, abrake shaft, a brake arm xed thereon at one end and secured to the freeend of said brake bandat the other end, an operating lever fixed on saidshaft, a stub shaft parallel with Said brake shaft, 'a cam nleverpivoted thereon and projecting above said brake shaft, a cam slot insaid cam lever, a roller on said operating lever movable in said slot, ahand lever pivoted to said brake shaft, a slidable connection betweensaid hand lever and one end of said cam lever, whereby the movement ofsaid hand lever will actuate said cam lever and said operating lever torotate said brake shaft, in the manner described.

3. A brake band, a brake shaft, a brake arm fixed lon said shaft andconnected to one end of said brake band, an operating lever fixed onsaid shaft and projectingy in the opposite direction from said brakearm, a hand lever pivoted upon said brake shaft, a cam slot therein, acam lever pivoted adjacent said brake shaft and engaging at one endinsaid cam slot, and a slidable connection between said cam lever and saidoperating lever, whereby an increasing mechanical advantage is obtainedon said operating lever as said hand lever is moved to pull the brakeband.

4. A leverage system for brakes .and the like including a brake shaft,brake arms xed thereon and extending forwardly therefrom for attachmentto a brake band,` a shaft operating lever xed on said shaft andprojecting in a direction substantially opposite to said brakearms, astub shaft spaced rearwardly from said brake shaft, a cam lever pivotedupon said stub shaft at one end, a hand lever pivoted upon said brakeshaft, cam slots in said hand lever and said cam lever, a roller on theforward end of said cam lever engaging in the cam slot in said handlever, and a roller on the outer end of said shaft operating leverengaging in the cam slot in said cam lever, wherebyV the power arm uponeach of said levers increases in length as said hand lever is swung toset the brakes.

5. A leverage system for brakes and the like including a brake shaft,brake arms xed thereon and extending forwardly therefrom for attachmentto a brake band, a shaft operating lever xed on said shaft andprojecting in a direction f substantially opposite to said brake arms, astub shaft spaced rearwardly from said brake shaft, a cam lever pivotedupon said stub shaft at one end, a hand lever pivotally` supportedadjacent said brake larms and extending normally upward- 6. A leveragesystem for brakes and the like "l including a brake shaft, brake armsfixed thereon and extending forwardly therefrom for attachment to abrake band, a shaft operating lever fixed on said shaft and projectingin a direction substantially opposite to said Ybrake arms, a stub shaftspaced rearwardly from said brake shaft, a cam lever pivoted upon saidstub shaft at one end, a hand lever pivoted upon said brake shaft, camslots in said handlever and said cam lever,

a slidable engagement of the upper end ofV said .'1.

cam lever inthe camslot of said hand lever, a similar' engagement of theend of said shaft operating lever in the cam-slot in said cam lever,whereby the power 'arm upon each of said levers increases in lengthiassaid hand lever is swung to set the brakes.

7. A lever mechanism for brakes and the like, including a brake shaft, abrake band engaging arm thereon extending forwardly and downwardlytherefrom, a brake operating lever extending from said shaft in asubstantially opposite direction, said arm and lever being xed relativeto each other to move simultaneously, a hand lever pivotally mounted onsaid brake shaft, a cam lever pivoted at one end behind said brakeshaft, and slidable operative connections between said cam lever andsaid hand lever at the forward end of said cam lever` and between saidbrake operating lever intermediate the ends of said cam lever, saidconnections being movable to lengthen the power arm and shorten theWeight arm as said hand lever is moved to brake setting position.

8. A lever mechanism for brakes and the like, :including a brake shaft,a brake band engaging .arm thereon extending forwardly and downwardlytherefrom, a brake operating lever extending from said shaft in asubstantially opposite direction, said arm and lever being xed relativetoeach other to move simultaneously, a cam lever pivoted to the rear ofsaid shaft, a cam slot in said cam lever, a sliding engagement of saidshaft operating lever in said slot, and a hand lever pivoted lat itslower end and engaging the end of said cam lever to exert a pullthereon, as the lever is moved to brake setting position.

9. A leverage system for brakes and the like including a brake shaft, abrake band engaging arm and a shaft operating lever fixed on said shaftand extending in substantially opposed directions therefrom, a stubshaft to the rear of said brake shaft, a cam lever pivoted to said stubshaft and extending forwardly, a hand operated lever pivoted at itslower end and having a slidable operative engagement with the forwardend of the said cam lever, a cam slot in said cam lever, and means onsaid shaft operating lever engaging slidably in said slot whereby thepower arm of each lever approaches its maximum as said hand lever isoperated in a brake setting direction.

. CARL M. ANDERSON.

